math_cms/app/Services/ImageProcessingService.php

<?php

namespace App\Services;

use Intervention\Image\ImageManager;
use Intervention\Image\Drivers\Gd\Driver;
use Illuminate\Support\Facades\Storage;

class ImageProcessingService
{
    protected $manager;

    public function __construct()
    {
        $this->manager = new ImageManager(new Driver());
    }

    /**
     * Crop an image based on the given coordinates.
     *
     * @param string $sourcePath Absolute path to the source image.
     * @param int $yMin Starting Y coordinate.
     * @param int $yMax Ending Y coordinate.
     * @param string $outputPath Absolute path to save the cropped image.
     * @return bool True on success, false on failure.
     */
    public function cropImage(string $sourcePath, int $yMin, int $yMax, string $outputPath): bool
    {
        try {
            if (!file_exists($sourcePath)) {
                throw new \Exception("Source image not found: {$sourcePath}");
            }

            $image = $this->manager->read($sourcePath);
            $width = $image->width();
            $height = $image->height();

            // Validate coordinates
            $yMin = max(0, $yMin);
            $yMax = min($height, $yMax);
            $cropHeight = $yMax - $yMin;

            if ($cropHeight <= 0) {
                throw new \Exception("Invalid crop height: {$cropHeight} (yMin: {$yMin}, yMax: {$yMax})");
            }

            // Crop the full width of the image for the given Y range
            $image->crop($width, $cropHeight, 0, $yMin);
            
            $image->save($outputPath);

            return true;
        } catch (\Exception $e) {
            \Log::error("Image cropping failed: " . $e->getMessage());
            return false;
        }
    }
}